Newton’s second law best summarizes the effect of the forces acting on the object.

14.

Which of the following units is equivalent to a newton (N)?

A.

Kg·m/s2

B.

G·cm/s

C.

Kg·s2/m

D.

Kg·m/s

E.

Kg·cm/s2

15.

A 4.0-kg object, A, and a 2.0-kg object, B, are connected with a rope. A force is applied to another rope attached to the 2.0-kg object that pulls both A and B along a horizontal surface. Which of the following statements is true?

A.

The force that B exerts on A is greater than the force that A exerts on B.

B.

The force that A exerts on B is greater than the force that B exerts on A.

C.

The force that B exerts on A is equal to the force that A exerts on B regardless of the motion of the system.

D.

The force that B exerts on A is equal to the force that A exerts on B provided that the system slides with uniform motion.

E.

The sum of the applied force and the force that B exerts on A is equal to the force that A exerts on B.

16.

Three masses are suspended vertically as shown in the diagram below. The system is accelerating upward. What is the relationship among the forces of tension?

A.

|FT1| = |FT2| = |FT3|

B.

|FT1| > |FT2| > |FT3|

C.

|FT1| < |FT2| < |FT3|

D.

|FT1| > |FT2| < |FT3|

E.

|FT1| > |FT3| < |FT2|

17.

The physical quantity, which is the measure of inertia, is

A.

Density

B.

Weight

C.

Force

D.

Acceleration

E.

Mass

18.

Which law is in control of a spaceship which cruises through space at constant speed without using any fuel?

A.

Newton's first law

B.

Newton's second law

C.

Newton's third law

D.

Both A and B

E.

All of the above

19.

An object is hanging by two strings, A and B, anchored to the ceiling as in the diagram below. Each string holds the object in place with a force of 40 N at 30 degrees to the vertical. Determine the force of gravity required to keep the object motionless.